Apparent Solar Time

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apparent solar time: see solar time solar time, time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial.
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apparent solar time [ə′pa·rənt ¦so·lər ′tīm]

(astronomy)

Time measured by the apparent diurnal motion of the sun. Also known as apparent time; true solar time.

Apparent Solar Time

(or true solar time), a system of reckoning time in which the length of the day is taken to be equal to the interval between two successive passages of the sun’s center through the southern portion of the celestial meridian (upper culminations). Apparent solar time is reckoned from the upper culmination of the sun’s center, that is, from apparent noon. The length of the apparent solar day varies during the course of a year.

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